scholarly journals A synthetic ice core approach to estimate ion relocation in an ice field site experiencing periodical melt: a case study on Lomonosovfonna, Svalbard

2016 ◽  
Vol 10 (3) ◽  
pp. 961-976 ◽  
Author(s):  
Carmen P. Vega ◽  
Veijo A. Pohjola ◽  
Emilie Beaudon ◽  
Björn Claremar ◽  
Ward J. J. van Pelt ◽  
...  
Keyword(s):  
Ice Core ◽  
Chemical Properties ◽  
Ice Cores ◽  
Weather Conditions ◽  
Ice Field ◽  
Physical Stratigraphy ◽  
Physical And Chemical ◽  
Annual Resolution ◽  
And Chemical Properties

Abstract. Physical and chemical properties of four different ice cores (LF-97, LF-08, LF-09 and LF-11) drilled at Lomonosovfonna, Svalbard, were compared to investigate the effects of meltwater percolation on the chemical and physical stratigraphy of these records. A synthetic ice core approach was employed as reference record to estimate the ionic relocation and meltwater percolation length at this site during the period 2007–2010. Using this method, a partial ion elution sequence obtained for Lomonosovfonna was NO3− > SO42−, Mg2+, Cl−, K+, Na+ with nitrate being the most mobile within the snowpack. The relocation length of most of the ions was on the order of 1 m during this period. In addition, by using both a positive degree day (PDD) and a snow–energy model approaches to estimate the percentage of melt at Lomonosovfonna, we have calculated a melt percentage (MP) of the total annual accumulation within the range between 48 and 70 %, for the period between 2007 and 2010, which is above the MP range suggested by the ion relocation evidenced in the LF-syn core (i.e., MP  =  30 %). Using a firn-densification model to constrain the melt range, a MP of 30 % was found over the same period, which is consistent with the results of the synthetic ice core approach, and a 45 % of melt for the last 60 years. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution when weather conditions were similar to those during the 2007–2010 period.

scholarly journals A <i>synthetic</i> ice core approach to estimate ion relocation in an ice field site experiencing periodical melt; a case study on Lomonosovfonna, Svalbard

2015 ◽  
Vol 9 (5) ◽  
pp. 5053-5095
Author(s):  
C. P. Vega ◽  
V. A. Pohjola ◽  
E. Beaudon ◽  
B. Claremar ◽  
W. J. J. van Pelt ◽  
...  
Keyword(s):  
Ice Core ◽  
Chemical Properties ◽  
Ice Cores ◽  
Field Site ◽  
Ice Field ◽  
Physical Stratigraphy ◽  
Physical And Chemical ◽  
Annual Resolution ◽  
And Chemical Properties

Abstract. Physical and chemical properties of four different ice cores (LF-97, LF-08, LF-09 and LF-11) drilled at Lomonosovfonna, Svalbard, were compared to investigate the effects of meltwater percolation on the chemical and physical stratigraphy of these records. A synthetic ice core approach was employed as reference record to estimate the ionic relocation and meltwater percolation length at this site during the period 2007–2010. Using this method, the ion elution sequence obtained for Lomonosovfonna was SO42- > NO3- > NH4+ > Mg2+ > Cl-, K+ > Na+ > Ca2+, with acidic ions being the most mobile within the snowpack. The relocation length of most of the ions was in the order of 1 m, with the exception of SO42- showing relocation lengths > 2 m during this period. In addition, by using both a positive degree day (PDD) and a snow-energy model approaches to estimate the percentage of melt at Lomonosovfonna, we have calculated a melt percentage (MP) of the total annual accumulation within the range between 48 and 70 %, for the period between 2007 and 2010 which is above the MP range suggested by the ion relocation evidenced in the LF-syn core (i.e. MP = 30 %). Using a firn-densification model to constrain the melt range, a MP of 30 % was found over the same period which is consistent with the results of the synthetic ice core approach, and a 45 % of melt for the last 60 years. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution.

Physical and Chemical Properties of Mineral in Soils of Cassava Cropping Area: A Case Study in Chonburi Province

2014 ◽  
Vol 979 ◽  
pp. 440-443
Author(s):  
W. Siriprom ◽  
K. Teanchai ◽  
S. Kongsriprapan ◽  
J. Kaewkhao ◽  
N. Sangwaranatee
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Chemical Properties ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

The chemical and physical properties of topsoil and subsoil which collected from the cassava cropping area in Chonburi Province have been investigated. The characterization of both soil sample were used X-Ray Diffraction (XRD), Energy Dispersive X-Ray Fluorescence (EDXRF) while FTIR used to confirmed the formation of intermolecular bonding and Thermo-Gravimetric Analysis (TGA) used for investigated the crystalline. It was found that, the XRD pattern indicated quartz phase. The chemical composition by XRF reported that the soils samples consist of Si, Al, Ca, Fe, K, Mn, Ti, Cr, Zn, Ag and Cu. and TGA results, noticed that the removal of moisture and organics material.

SENSITIVITY ANALYSIS IN OIL SPILL MODELS: CASE STUDY USING ADIOS

1995 ◽  
Vol 1995 (1) ◽  
pp. 898-900 ◽  
Author(s):  
Roy Overstreet ◽  
Andrzej Lewandowski ◽  
William Lehr ◽  
Robert Jones ◽  
Debra Simecek-Beatty ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Oil Spill ◽  
Oil Spills ◽  
Chemical Properties ◽  
First Order ◽  
Mass Losses ◽  
Data Inquiry ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACT The Hazardous Material Response and Assessment Division (HAZMAT) at the National Oceanic and Atmospheric Administration uses the oil weathering software package named Automated Data Inquiry for Oil Spills (ADIOS) to investigate the oil weathering process. This model combines a database of physical and chemical properties of oils with a simulation model computing mass losses, density, viscosity, and water content of an oil spill due to evaporation, dispersion, and emulsification. A first-order sensitivity analysis of the ADIOS evaporation algorithm indicates that it might be possible to provide a taxonomy of oils with respect to the reliability of results generated by the model.

scholarly journals FUEL PROPERTIES OF UKRAINIAN CORN STOVER

2018 ◽  
Vol 40 (3) ◽  
pp. 85-90 ◽  
Author(s):  
V. O. Antonenko ◽  
V.I. Zubenko ◽  
O.V. Epik
Keyword(s):  
Corn Stover ◽  
Chemical Properties ◽  
Weather Conditions ◽  
Thermal Conversion ◽  
Physical And Chemical Properties ◽  
Melting Temperatures ◽  
Single Location ◽  
Ash Melting ◽  
Physical And Chemical ◽  
And Chemical Properties

 In order to provide reliable and efficient thermal conversion, it is necessary to understand the physical and chemical properties of corn stover. The properties of corn stover depend on species, climatic and weather conditions, soil type, fertilizer input etc. Thus, it is necessary to study the fuel from various locations. The present paper describes analysis results of corn stover from a single location in Kyiv region, Ukraine. The soil was fertilized with anhydrous ammonia 80 kg/ha. Elemental composition (W, A, C, H, S, N, O, Cl), calorific values, ash melting temperatures and ash chemical composition of the samples have been tested. The comparative analysis of the samples with foreign analogues has been carried out. It is shown that the test samples of corn stover from Kyiv region are characterized by ash initial deformation temperatures of 1160 - 1200 °C. These temperatures are higher than the average agricultural biomass values and typical for woody biomass. The relatively high ash melting temperature reduces risks of sintering and deposit formation on the furnace inner surface.

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